INFLUENCE OF RESTRICTIVE FEEDING ON THE PERFORMANCE OF BROILER CHICKENS

Autor: Janječić, Zlatko, Mužic, Stjepan, Pintar, Jasna, Bedeković, Dalibor, Kovačić, Matija
Jazyk: chorvatština
Rok vydání: 2013
Předmět:
Zdroj: Krmiva : Časopis o hranidbi životinja, proizvodnji i tehnologiji krme
Volume 55
Issue 4
ISSN: 1848-901X
0023-4850
Popis: Cilj ovog rada bio je utvrditi učinak kvantitativnog ograničenja krmne smjese u različitoj dobi brojlerskih pilića na njihove proizvodne rezultate. U istraživanju je korišteno 80 muških pilića Ross – 21 koji su s ujednačenim masama u dobi od se¬dam dana podijeljeni u četiri skupine. Kontrolna skupina pilića (0) je tijekom tova do dobi od 35 dana hranjena po volji, pokusna skupina (1) je hranjena restriktivno od 7. do 14. dana, pokusna skupina (2) od 14. do 21. dana, a pokusna skupina (3) od 7. do 21. dana. Nakon programa restriktivne hranidbe pilići su do kraja istraživanja hranjeni ad libitum. Restrikcija je predstavljala umanjenje dostupnosti krmne smjese pilićima od 30 % od preporuka za pojedinu dob pilića. Svi pilići bili su vagani u dobi od 7, 14, 21, 28 i 35 dana. Nakon završetka istraživanja iz svake skupine nasumično je odabrano po 5 pilića koji su bili usmrćeni te klaonički obrađeni. U dobi od 35 dana prosječne tjelesne mase pilića po skupinama iznosile su: 2374, 2133, 2242 i 1888 grama. Konverzija krmne smjese po skupinama je iznosila 1,70; 1,62; 1,72 i 1,86 kg/kg. Randman klanja po skupinama iznosio je 73,8; 72,5; 72,4 i 70,4 %. Pilići 1. i 2. pokusne skupine imali su najmanje abdominalne masti. Nakon obračuna ukupnih troškova i prihoda neto dobit po skupinama po prosječnom piletu iznosila je 3,7; 3,4; 3,0 i 1,2 kune. Restriktivna hranidba tovnih pilića u ranijoj dobi dala je nešto manju dobit ali je zamašćenost trupa manja, pa svrsishodnost restrikcije treba prosuđivati s dva stanovišta: korisnost za tovljača ili klaoničku vrijednost utovljenih pilića.
The aim of this study was to determine the effect of quantitative restrictions of feed mixture at different stages of life on the performance of broiler chickens. Eight¬ing male chickens Ross-21 of uniform mass at the age of seven days were used in the study and randomly divided into four groups. The control group of chickens (0) during the whole fattening period of 35 days were fed at libitum, the experimental group (1) were fed restrictively from 7th to 14th day, the experimental group (2) from 14th to 21st days, and the experimental group (3) from 7th to 21st days. After that period of restrictive feeding chickens were fed ad libitum to the end of the study. Restrictive feeding meant reduction of availability of feed mixture for chickens in the amount of 30% of the recommendations for chickens that age. All birds were weighed at the age of 7, 14, 21, 28 and 35 days. At the end of the study 5 chickens from each group was randomly chosen, sacrificed and trimmed. At the age of 35 days the average body mass of chickens were as follows: 2374, 2133, 2242 and 1888 grams. Feed conversion was 1.70, 1.62, 1.72 and 1.86. Carcass yield was 73.8, 72.5, 72.4 and 70.4%. The chickens from 1st and 2nd experimental group had less abdominal fat than other groups. Net income per group was 3.7, 3.4, 3.0 and 1.2 kunas per average chicken. Restrictive feeding of broiler chickens at an early age gave a slightly lower profit but the carcasses had less abdominal fat, so the ap¬propriateness of the restrictive feeding should be judged from two points of view: the usefulness for the farmer and slaughter value of fattened chickens.
Databáze: OpenAIRE
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